HTS Heading 8409

Parts suitable for use solely or principally with the engines of heading 8407 or 8408

All 22 HTS codes under heading 8409 (parts suitable for use solely), with their duty rates from the 2026 HTS Revision 23. General duty Free to 2.5%.

Every line of heading 8409

  • 8409 Parts suitable for use solely or principally with the engines of heading 8407 or 8408.
  • 8409.10.00 For aircraft engines (under: Parts suitable for use solely or principally with the engines of heading 8407 or 8408): General Free; Special none; Column 2 35%.
  • 8409.10.00.40 For use in civil aircraft (under: For aircraft engines) (kg).
  • 8409.10.00.80 Other (under: For aircraft engines) (kg).
  • 8409.91 Suitable for use solely or principally with spark-ignition internal combustion piston engines (including rotary engines).
  • 8409.91.10 Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery: General Free; Special none; Column 2 10%.
  • 8409.91.10.40 For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704 (kg).
  • 8409.91.10.60 For marine propulsion engines (kg).
  • 8409.91.10.80 Other (under: Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery) (kg).
  • 8409.91.30.00 Aluminum cylinder heads (under: To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704) (No., kg): General 2.5%; Special Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8409.91.50 Other (under: To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704): General 2.5%; Special Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8409.91.50.10 Connecting rods (under: Other) (No., kg).
  • 8409.91.50.81 Steel forgings (under: Other) (kg).
  • 8409.91.50.85 Other (under: Other) (kg, No.).
  • 8409.91.92 For marine propulsion engines: General 2.5%; Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8409.91.92.10 Connecting rods (under: For marine propulsion engines) (No., kg).
  • 8409.91.92.90 Other (under: For marine propulsion engines) (kg).
  • 8409.91.99 Other (under: Other): General 2.5%; Special Free (A*,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8409.91.99.10 Connecting rods (under: Other) (No., kg).
  • 8409.91.99.90 Other (under: Other) (kg).
  • 8409.99 Other (under: Other).
  • 8409.99.10 Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery: General Free; Special none; Column 2 10%.
  • 8409.99.10.40 For vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704 (kg).
  • 8409.99.10.60 For marine propulsion engines (kg).
  • 8409.99.10.80 Other (under: Cast-iron parts, not advanced beyond cleaning, and machined only for the removal of fins, gates, sprues and risers or to permit location in finishing machinery) (kg).
  • 8409.99.91 To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704: General 2.5%; Special Free (A*,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8409.99.91.10 Connecting rods (under: To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704) (No., kg).
  • 8409.99.91.90 Other (under: To be installed in vehicles of subheading 8701.21, 8701.22, 8701.23, 8701.24 or 8701.29, or heading 8702, 8703 or 8704) (kg, No.).
  • 8409.99.92 For marine propulsion engines: General 2.5%; Special Free (A,AU,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8409.99.92.10 Connecting rods (under: For marine propulsion engines) (No., kg).
  • 8409.99.92.90 Other (under: For marine propulsion engines) (kg).
  • 8409.99.99 Other (under: Other): General Free; Special none; Column 2 35%.
  • 8409.99.99.10 Connecting rods (under: Other) (No., kg).
  • 8409.99.99.90 Other (under: Other) (kg).

From MFG Calcs data: Internal combustion engines

U.S. imports of internal combustion engines (headings 8407, 8408, 8409) came to $27.69B in 2025, with $3.49B in calculated duty: an effective duty of 12.6%, every duty included.

Effective duty in Sep 2026: 7.9%, against 20.0% in Sep 2025.

Largest sources in 2025: Mexico $9.95B at 9.3% effective duty; Japan $3.72B at 13.7% effective duty; Canada $3.44B at 2.7% effective duty; Germany $2.05B at 14.3% effective duty; South Korea $1.70B at 7.6% effective duty.

These are family totals from U.S. import statistics published through USITC DataWeb, not this heading's rate alone; effective duty is calculated duty as a share of customs value, an estimate, not a ruling.

About these rates

The rates are those printed in the 2026 HTS Revision 23, published by the U.S. International Trade Commission. A 10-digit statistical line takes the rates printed on the 8-digit line above it. Chapter 99 duties (Section 232, Section 301, IEEPA) depend on the product, the origin and the date, are charged on top, and are not included. A code here is a strong lead, not a ruling: confirm it with a customs broker or a CBP binding ruling.

Last reviewed 2026-11-12.